Unlock instant, AI-driven research and patent intelligence for your innovation.

Watermark embedding and extracting method and system for vector tile anti-splicing

A watermark embedding and tile technology, applied in the field of geographic information security, can solve problems such as inapplicability of vector tiles and difficulty in extracting watermark information

Pending Publication Date: 2022-08-05
NANJING NORMAL UNIVERSITY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above algorithm can realize the embedding and detection of watermark information, it is difficult to extract the corresponding watermark information after the vector tiles are spliced, and it is not applicable to vector tiles

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Watermark embedding and extracting method and system for vector tile anti-splicing
  • Watermark embedding and extracting method and system for vector tile anti-splicing
  • Watermark embedding and extracting method and system for vector tile anti-splicing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0167] like image 3 , this embodiment selects 9 adjacent pieces of vector tile data as experimental data, image 3 (a) is the vector tile data A; image 3 (b) is the vector tile data B; image 3 (c) is the vector tile data C; image 3 (d) is the vector tile data D; image 3 (e) is the vector tile data E; image 3 (f) is the vector tile data F; image 3 (g) is the vector tile data G; image 3 (h) is the vector tile data H; image 3 (i) is the vector tile data I; the data format is GeoJSON.

[0168] 1. Watermark information generation:

[0169] Step 1: Construct eight different binary images of size 30*30, such as Figure 4 shown, Figure 4 (a) is a watermark image with the content "number"; Figure 4 (b) is a watermark image whose content is "word"; Figure 4 (c) is a watermarked image with the content "water"; Figure 4 (d) is a watermark image whose content is "mark"; Figure 4 (e) is a watermarked image with the content "Edition"; Figure 4 (f) is a watermark...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a watermark embedding and extracting method and system for vector tile anti-splicing, and relates to the technical field of geographic information security. The embedding method comprises the following steps: generating a watermark information sequence and a positioning information sequence according to a watermark image; determining an angular point set and a positioning information embedding angle according to the element type of the vector tile data; determining an angle value based on the positioning information sequence and the positioning information embedding angle; obtaining an embedded positioning information angle according to the angle value and a point closest to the angular point; drawing a circle by taking the angular point as a circle center and taking a first distance determined according to the embedded positioning information angle as a radius to obtain a circle corresponding to the angular point, and determining a first internally tangent rectangle according to the circles corresponding to all the angular points; normalizing all points in the first internally tangent rectangle to obtain normalized coordinate scale values; determining a normalized coordinate scale value according to the normalized coordinate scale value, the watermark information sequence and the coordinate scale value; embedding of watermark information is completed according to the normalized coordinate scale value. The method is suitable for vector tiles.

Description

technical field [0001] The invention relates to the technical field of geographic information security, in particular to a watermark embedding and extraction method and system for vector tile anti-splicing. Background technique [0002] The vector tile data in the network environment is very easy to download, which not only brings convenience, but also leads to security problems such as leakage and piracy. Therefore, it is necessary to study the information security technology suitable for vector tiles. [0003] "Digital Watermarking Technology and Application" (Sun Shenghe et al. Beijing: Science Press, 2004) pointed out that digital watermarking technology can prove copyright attribution or track infringement by embedding some secret information in protected digital objects. After the watermark information is embedded, it does not affect the value and use of the original content. When suspicious data is found, the watermark information is extracted to prove the ownership ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T7/60
CPCG06T1/0021G06T7/60
Inventor 朱长青许金宇任娜
Owner NANJING NORMAL UNIVERSITY